The design of a ZIMM bevel gearbox of the ZK Series is based on torque, speed and power at the input and output. In addition, the operating factor, temperature factor, speed factor and duty factor are included. For gearbox selection, design torque, design power and thermal limit power are calculated. A breather is required from 80% of the thermal limit power.
Which input variables are required for the design of a ZIMM bevel gearbox of the ZK Series?
The following variables are used for the design of a ZIMM bevel gearbox of the ZK Series:
| Symbol | Meaning | Unit |
| TD | Input torque | Nm |
| PD | Input power | kW |
| nD | Input speed | min⁻¹ |
| TAC | Output torque | Nm |
| PAC | Output power | kW |
| nAC | Output speed | min⁻¹ |
| i | Drive ratio | – |
| η | Gearbox efficiency | – |
| TAC;n | Output torque of a load case | Nm |
| nAC;n | Output speed of a load case | min⁻¹ |
| tn | Time share of a load case | min⁻¹ |
| Ta;AC | Design torque at the output | Nm |
| Pa | Design power at the gearbox | kW |
| Pt | Thermal limit power | kW |
| fb | Operating factor | – |
| ft | Temperature factor | – |
| fd | Speed factor | – |
| fe | Duty factor | – |
In which steps is a ZIMM bevel gearbox of the ZK Series designed?
The design of a ZIMM bevel gearbox of the ZK Series is carried out in a calculation sequence:
- Calculate the input torque at shaft D.
- Calculate the output torque at shaft A or C.
- Calculate the output speed.
- Calculate the output power.
- Determine the operating factor, temperature factor, speed factor and duty factor.
- Calculate the design torque at the output.
- Calculate the design power at the gearbox.
- Calculate the thermal limit power.
- Compare the calculated values with the permissible table values.
- Check whether a breather is required from 80% of the thermal limit power.
